日本ではリング状のものが早くから普及したため「避妊リング」と呼ばれることも多い。
In Japan the ring shaped ones came into use first so they're also often called contraceptive rings.
contraceptive rings
She is in need of help.
I'd like you to have a thorough examination.
This device made it possible to turn sea-water into fresh water easily.
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